Apartment from mid february! (Florence)

Hi everyone, I am desperately looking for an apartment in Florence city, from the middle of February for a min of 18 moths. I am able to pay max 800/850E a month and do not have particular request about the location but to have bus stops near by since i currently do not own a car. Preferably I would pick Campo di Marte area or around because it will be comfy for me and job but i can also evaluate other options. PLEASE HELP!!! Time is running out!!